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Because the div is not a valid ASP.NET control Only valid controls are linked to the respective event handler by ASP.NET.
If you are trying to execute this server event you need to generate a postback (_doPostBack and handle the post back call yourself in the server logic.

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UHmm. please post the following info:
- VS/ASP.NET version.
- Page markup (aspx) file. You may not need to do this call at all if there are other asp.net controls generating postback in the page.
- Whether this page is master/child page.
Post how the html is generated in browser. Want to check if the id is bein changed in the browser.